Robert Oster bottle ink, Sinner's Weed, 50ml

Robert Oster Signature Ink – Sinner's Weed

Sinner's Weed is a colour with attitude and unexpected depth. It leans into the world of rich greens and shadowed moss tones, shifting gently as it dries to reveal layers of character and quiet complexity. It is earthy, atmospheric and expressive, offering a shade that feels grounded yet full of movement on the page.

Crafted in South Australia, Sinner's Weed flows smoothly and shades beautifully, making it ideal for journaling, sketching or thoughtful everyday writing. This is an ink for writers who appreciate colours with personality, mood and a touch of mystery.

A drink for your pen.

The Remarkable Robert Oster

Robert Oster is a South Australian colour creator whose inks reflect passion, artistry and a deep connection to the Australian landscape. His colours are known around the world for their expressive shading, reliability and distinctive character.

Each bottle of Robert Oster Signature Ink is handmade in Australia and presented in a recyclable 50 ml PET bottle produced in Australia’s first carbon neutral plastics plant. Every blend is non-toxic and environmentally considerate, created with care for both the writer and the world they write in.